/Engine/Source/Runtime/MeshUtilitiesCommon/Public/MeshUtilitiesCommon.h
This function compute the angle of a triangle corner, it will return zero if the triangle is degenerated
namespace TriangleUtilities { static float TriangleUtilities::ComputeTriangleCornerAngle ( const FVector3f & PointA, const FVector3f & PointB, const FVector3f & PointC ) }